Issued for use in the British Post Offices in Morocco, this commemorative stamp marks the Coronation of King George VI and Queen Elizabeth on 12 May 1937. The design shows finely engraved portraits of the newly crowned King and Queen beneath the Imperial State Crown, with the royal cypher “GRI” (George Rex Imperator) at center. The base issue is from Great Britain, overprinted “MOROCCO AGENCIES” in bold serif type and surcharged with the value 15 Céntimos in blue for local postal use. Such overprinted issues highlight the historical role of British postal operations abroad, making them a significant branch of philately. Collectors prize these coronation overprints for their dual historical resonance—celebrating royal succession and reflecting imperial postal administration in Morocco.